Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Couples' personalities converge over time to make partners more and more similar.
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As a rule, 66 percent of people keep their eyes closed while kissing. The rest take pleasure in watching the emotions run the gamut on the faces of their partners.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
26
The average person will go on a date at least 100 times before they finally marry.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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The single biggest predictor of love is proximity.
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You burn 26 calories in a one minute kiss.
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